[Numpy-discussion] need help building a numpy extension that uses fftpack on windows
Fri Jun 3 04:15:04 CDT 2011
On Thu, Jun 2, 2011 at 9:33 PM, Robert Kern <email@example.com> wrote:
> On Thu, Jun 2, 2011 at 14:07, Ralf Gommers <firstname.lastname@example.org>
> > On Wed, Jun 1, 2011 at 5:45 PM, martin smith <email@example.com>
> >> I have a bit of code that performs multi-taper power spectra using numpy
> >> and a C extension module. The C portion consists of an interface file
> >> and a python-unaware computational file. The latter invokes fftpack.
> >> The straightforward setup.py appended below works fine on Linux. On
> >> Windows using MinGW it's not so good. I first created a libpython27.a
> >> file following instructions on the web. The C code now compiles but
> >> fails to link since there is no fftpack_lite.so on Windows. I can't
> >> find an fftpack_lite.dll (or even the source for fftpack_lite) and don't
> >> know where to turn.
> > Python dll's on Windows have a .pyd extension, there should be a
> > fftpack_lite.pyd file. But you should be able to just leave off the
> > extension, so it does the right thing on any platform.
> > Also, the way you specified library_dirs doesn't work if numpy is not in
> > site-packages, better to use something like:
> > library_dirs = [os.path.join(numpy.__path__, 'fft')]
> That said, there is no good cross-platform way to link against other
> Python extension modules. Please do not try. You will have to include
> a copy of the FFTPACK code in your own extension module.
> Coming back to #608, that means there is no chance that the C version will
land in scipy, correct? We're not going to ship two copies of FFTPACK. So
the answer should be "rewrite in Python, if that's too slow use Cython".
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